684628889 has 8 divisors (see below), whose sum is σ = 783357120. Its totient is φ = 586131696.

The previous prime is 684628877. The next prime is 684628927. The reversal of 684628889 is 988826486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684628889 - 2¹⁶ = 684563353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684628859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51359 + ... + 63300.

It is an arithmetic number, because the mean of its divisors is an integer number (97919640).

Almost surely, 2^684628889 is an apocalyptic number.

It is an amenable number.

684628889 is a deficient number, since it is larger than the sum of its proper divisors (98728231).

684628889 is a wasteful number, since it uses less digits than its factorization.

684628889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115519.

The product of its digits is 10616832, while the sum is 59.

The square root of 684628889 is about 26165.4139848771. The cubic root of 684628889 is about 881.3567608430.

The spelling of 684628889 in words is "six hundred eighty-four million, six hundred twenty-eight thousand, eight hundred eighty-nine".